Finding the Fourth Proportional to 31,116.84, 42,940.17 and 17,688.66

Step by Step Solution

1. Step 1: Write the proportion equation
   31,116.84 : 42,940.17 = 17,688.66 : x
2. Step 2: Convert to fraction form
   31,116.84/42,940.17 = 17,688.66/x
3. Step 3: Cross multiply
   31,116.84x = 42,940.17 × 17,688.66
4. Step 4: Simplify right side
   31,116.84x = 759,554,067.47
5. Step 5: Solve for x
   x = 759,554,067.47/31,116.84
6. Step 6: Final answer
   x = 24,409.74